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Wednesday, July 24, 2013

Temperature + Dew Point For Pace Adjustments

Since Dew Point is a more useful measure of the water saturation
of the air and thus its effect on our body while we run, I am recommending
using it (rather than relative humidity), in conjunction with air temperatures, in determining warm weather pace
adjustments to training.

The revised training pace adjustment formula is as follows:

Add together air temperature and dew point and see where the
combined number places you on the following adjustment chart:

100 or less: no pace adjustment

101 to 110: 0% to
0.5% pace adjustment

111 to 120: 0.5% to
1.0% pace adjustment

121 to 130: 1.0% to
2.0% pace adjustment

131 to 140: 2.0% to
3.0% pace adjustment

141 to 150: 3.0% to
4.5% pace adjustment

151 to 160: 4.5% to
6.0% pace adjustment

161 to 170: 6.0% to
8.0% pace adjustment

171 to 180: 8.0% to
10.0% pace adjustment

Above 180: hard
running not recommended

Note: a range is given as there are numerous individual factors, such as the size, fitness and physical make-up of the runner, and their level of acclimatization to the heat and air saturation levels, that will play into how much of a pace adjustment is needed.

The above are the pace adjustment percentages to use for continuous runs. For repeat workouts such as 400’s 800’s, or mile repeats, I recommend using half of the continuous run adjustment as the
body has a chance to cool somewhat during the recovery between repeats.

For those who want help doing the math for these adjustments
the following charts calculate the adjusted pace for various paces and %
adjustments.

Examples:

At the time of our planned continuous run the air temperature is 74 degrees and dew point if 71 degrees - a typical early morning in summer over much southern United States this summer. We would add these 2 numbers together to get 145 (74 + 71).

According to our chart, a total of 145 calls for a pace adjustment of 3% to 4.5%. We had planned to do our run at 7:00 pace under normal conditions, so we adjust the 7:00 pace by 3% to 4.5% and get an adjusted pace range of 7:13 to 7:19 per mile.

If, under those same weather conditions we had planned to run 8 x half mile repeats at 3:00 per repeat (6:00 per mile pace). We would cut the 3% to 4.5% pace adjustment in half and use a 1.5% to 2.25% pace adjustment. A 1.5% to 2.25% on 6:00 pace is a 6:06 to 6:08. So instead of targeting 3:00 per half mile, we would have an adjusted target of 3:03 to 3:04 per half mile.

Prior Method

Most of the pace adjustments obtained using this method align very closely to what I have shared previously when using relative humidity to adjust air temperature; but I believe the use of both dew point and air temperature to be a more accurate basis for the adjustment calculations, so I am offering this modification.